Antenna



FIG. 1 is a perspective view of an antenna showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

The unshaded end portion of the antenna in FIG. 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an antenna, as shown and described. 